Identification

Title

Modern precipitation δ18O and trajectory analysis over the Himalaya-Tibet Orogen from ECHAM5-wiso simulations

Abstract

Variations in oxygen isotope ratios (O-18) measured from modern precipitation and geologic archives provide a promising tool for understanding modern and past climate dynamics and tracking elevation changes over geologic time. In areas of extreme topography, such as the Tibetan Plateau, the interpretation of O-18 has proven challenging. This study investigates the climate controls on temporal (daily and 6h intervals) and spatial variations in present-day precipitation O-18 (O-18(p)) across the Tibetan Plateau using a 30year record produced from the European Centre/Hamburg ECHAM5-wiso global atmospheric general circulation model (GCM). Results indicate spatial and temporal agreement between model-predicted O-18(p) and observations. Large daily O-18(p) variations of -25 to +5 occur over the Tibetan Plateau throughout the 30 simulation years, along with interannual O-18(p) variations of similar to 2. Analysis of extreme daily O-18(p) indicates that extreme low values coincide with extreme highs in precipitation amount. During the summer, monsoon vapor transport from the north and southwest of the plateau generally corresponds with high O-18(p), whereas vapor transport from the Indian Ocean corresponds with average to low O-18(p). Thus, vapor source variations are one important cause of the spatial-temporal differences in O-18(p). Comparison of GCM and Rayleigh Distillation Model (RDM)-predicted O-18(p) indicates a modest agreement for the Himalaya region (averaged over 86 degrees-94 degrees E), confirming application of the simpler RDM approach for estimating O-18(p) lapse rates across Himalaya.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d7fj2jfw

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

Text

originating controlled vocabulary

title

Resource Type

reference date

date type

publication

effective date

2016-01-01T00:00:00Z

Geographic location

West bounding longitude

East bounding longitude

North bounding latitude

South bounding latitude

Temporal reference

Temporal extent

Begin position

End position

Dataset reference date

date type

publication

effective date

2016-09-27T00:00:00Z

Frequency of update

Quality and validity

Lineage

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Limitations on public access

None

Responsible organisations

Responsible party

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact